What if his X4 opens by talking about how the events of DOFP changed things, and there's like a ten minute recap of how the Phoenix Saga was affected, resulting in Xavier still being alive, Cyclops being alive, and Jean in a coma?

Xavier will be alive in DOFP since they are bringing back Patrick Stewart. Jean being in a coma again would be repetitive and with Cyclops, they could create a whole story for X4 on why he disappeared.